Quantum Bayesian Networks

July 19, 2014

Yikes, How Will This Movie End?

Filed under: Uncategorized — rrtucci @ 5:43 pm

"Boys, it wasn't the airplanes that got him [D-Wave], twas beauty [the gate model quantum computer] that killed the beast." (last line of the prescient 1933 movie, "King Kong")

Boys, it wasn’t the airplanes that got him [D-Wave], twas beauty [gate model quantum computers] that killed the beast.– last line of the prescient 1933 movie, “King Kong”.

I am fairly confident that DWave will implement a more versatile Hamiltonian soon, but that won’t solve the problem they have that they are operating at a temperature above the energy gap. –  Peter Shor, Jun 24, 2014, source of quote

… they [D-Wave] use qubits with very short coherence times of the order of a few nanoseconds, while the total time to perform one annealing run is 20 microseconds. The qubits are thus coherent for only a fraction of the total time, and this raises the question whether they are “coherent enough” or “quantum enough” to show a quantum speedup. –Matthias Troyer, June 19 2014, source of quote



  1. Hi Bob: 1- Are you becoming obsessed with D-Wave, or are you taking over the role of “Chief D-Wave Skeptic” from Scott? Which is it?
    2- As you know, decoherence is “basis-dependant”, as is explained here by Dr. M. Amin, lead theorist at D-Wave: http://dwave.wordpress.com/2011/06/10/decoherence-myths-and-realities/
    3- You seem to have forgotten something very important; D-Wave IS THE ONLY GAME IN TOWN RIGHT NOW!! Gate-model is ONLY a dream, a chimera or maybe even a fantasy! By the time we get a true gate-model QC up and running, we may not be here!
    4- Any way, good luck either way!, and thanks.

    Comment by Sol Warda — July 19, 2014 @ 7:00 pm

  2. “are you taking over the role of “Chief D-Wave Skeptic” from Scott? ” No, never. I’m sure than some day our chief skeptic will get back on his horse and ride again.

    Comment by rrtucci — July 19, 2014 @ 7:59 pm

  3. Bob: Just to keep you mind off this heavy and heady stuff about quantum computers, check this “Ciao, Roma” feed from ISS, to remind you of the land of your ancestors! View in FULL screen. Enjoy.

    Comment by Sol Warda — July 19, 2014 @ 9:13 pm

  4. Always enjoy your post mr. T (I can call you mr t. right?)
    What I am wondering is that all this hoopla about Troyers study is nothing new, its funny, haven’t we, especially the press covered this before, and we decided to move on? All the press did is rehash the old material and sensationalize it and it worked. Its like the saying that people will believe a lie if you tell it often enough. On the other hand the hype goes both ways, for and against dwave. More objectivity is needed here.

    Comment by ramsey — August 6, 2014 @ 8:11 am

  5. Thanks for the message, R. I think that what D (D is what I affectionately call D-Wave) has done, is remarkable, and I am very interested in seeing how their machine works out. We’ll know much more by the beginning of next year when D’s 1000 qubit machine begins to show what it can and cannot do.

    I do think that gate model quantum computers are not going to go away as D competitors for very good scientific reasons. I also think a QC software company can allow itself the luxury not to bet on one platform over another, by writing software for both. Just like a software company could, if faced with two major competing platforms like Android and iPhone, try to write something for both.

    Comment by rrtucci — August 6, 2014 @ 4:07 pm

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